WebSVN – HelenOS – Diff – //branches/dd/kernel/generic/src/printf/vsnprintf.c



 
#include <print.h>
#include <printf/printf_core.h>
#include <string.h>
#include <memstr.h>
#include <errno.h>
 
typedef struct {
    size_t size;    /* Total size of the buffer (in bytes) */
    size_t len;     /* Number of already used bytes */
    char *dst;      /* Destination */
} vsnprintf_data_t;
 
/** Write string to given buffer.
 *
 * Write at most data->size plain characters including trailing zero.
 * According to C99, snprintf() has to return number of characters that
 * would have been written if enough space had been available. Hence
 * the return value is not the number of actually printed characters
 * but size of the input string.
 *
 * @param str  Source string to print.
 * @param size Number of plain characters in str.
 * @param data Structure describing destination string, counter
 *             of used space and total string size.
 *
 * @return Number of characters to print (not characters actually
 *         printed).
 *
 */
static int vsnprintf_str_write(const char *str, size_t size, vsnprintf_data_t *data)
{
    size_t left = data->size - data->len;
   
    if (left == 0)
        return ((int) size);

        data->len = data->size;
        return ((int) size);
    }
   
    if (left <= size) {
        /* We do not have enough space for the whole string
         * with the trailing zero => print only a part
         * of string
         */
        index_t index = 0;
       
        while (index < size) {
            wchar_t uc = str_decode(str, &index, size);
           
            if (chr_encode(uc, data->dst, &data->len, data->size - 1) != EOK)
                break;
        }
       
        /* Put trailing zero at end, but not count it
         * into data->len so it could be rewritten next time

    data->dst[data->len] = 0;
   
    return ((int) size);
}
 
/** Write wide string to given buffer.
 *
 * Write at most data->size plain characters including trailing zero.
 * According to C99, snprintf() has to return number of characters that
 * would have been written if enough space had been available. Hence
 * the return value is not the number of actually printed characters
 * but size of the input string.
 *
 * @param str  Source wide string to print.
 * @param size Number of bytes in str.
 * @param data Structure describing destination string, counter
 *             of used space and total string size.
 *
 * @return Number of wide characters to print (not characters actually
 *         printed).
 *
 */
static int vsnprintf_wstr_write(const wchar_t *str, size_t size, vsnprintf_data_t *data)
{
    index_t index = 0;
   
    while (index < (size / sizeof(wchar_t))) {
        size_t left = data->size - data->len;

            data->dst[data->size - 1] = 0;
            data->len = data->size;
            return ((int) size);
        }
       
        if (chr_encode(str[index], data->dst, &data->len, data->size - 1) != EOK)
            break;
       
        index++;
    }
   

        size,
        0,
        str
    };
    printf_spec_t ps = {
        (int(*) (const char *, size_t, void *)) vsnprintf_str_write,
        (int(*) (const wchar_t *, size_t, void *)) vsnprintf_wstr_write,
        &data
    };
   
    /* Print 0 at end of string - fix the case that nothing will be printed */
    if (size > 0)

Rev 4201	Rev 4296
Line 34...	Line 34...
34		34
35	#include <print.h>	35	#include <print.h>
36	#include <printf/printf_core.h>	36	#include <printf/printf_core.h>
37	#include <string.h>	37	#include <string.h>
38	#include <memstr.h>	38	#include <memstr.h>
-		39	#include <errno.h>
39		40
40	typedef struct {	41	typedef struct {
41	size_t size; /* Total size of the buffer (in bytes) */	42	size_t size; /* Total size of the buffer (in bytes) */
42	size_t len; /* Number of already used bytes */	43	size_t len; /* Number of already used bytes */
43	char dst; / Destination */	44	char dst; / Destination */
44	} vsnprintf_data_t;	45	} vsnprintf_data_t;
45		46
46	/** Write UTF-8 string to given buffer.	47	/** Write string to given buffer.
47	*	48	*
48	* Write at most data->size plain characters including trailing zero.	49	* Write at most data->size plain characters including trailing zero.
49	* According to C99, snprintf() has to return number of characters that	50	* According to C99, snprintf() has to return number of characters that
50	* would have been written if enough space had been available. Hence	51	* would have been written if enough space had been available. Hence
51	* the return value is not the number of actually printed characters	52	* the return value is not the number of actually printed characters
52	* but size of the input string.	53	* but size of the input string.
53	*	54	*
54	* @param str Source UTF-8 string to print.	55	* @param str Source string to print.
55	* @param size Number of plain characters in str.	56	* @param size Number of plain characters in str.
56	* @param data Structure describing destination string, counter	57	* @param data Structure describing destination string, counter
57	* of used space and total string size.	58	* of used space and total string size.
58	*	59	*
59	* @return Number of UTF-8 characters to print (not characters actually	60	* @return Number of characters to print (not characters actually
60	* printed).	61	* printed).
61	*	62	*
62	*/	63	*/
63	static int vsnprintf_write_utf8(const char str, size_t size, vsnprintf_data_t data)	64	static int vsnprintf_str_write(const char str, size_t size, vsnprintf_data_t data)
64	{	65	{
65	size_t left = data->size - data->len;	66	size_t left = data->size - data->len;
66		67
67	if (left == 0)	68	if (left == 0)
68	return ((int) size);	69	return ((int) size);
Line 75...	Line 76...
75	data->len = data->size;	76	data->len = data->size;
76	return ((int) size);	77	return ((int) size);
77	}	78	}
78		79
79	if (left <= size) {	80	if (left <= size) {
80	/* We have not enought space for whole string	81	/* We do not have enough space for the whole string
81	* with the trailing zero => print only a part	82	* with the trailing zero => print only a part
82	* of string	83	* of string
83	*/	84	*/
84	index_t index = 0;	85	index_t index = 0;
85		86
86	while (index < size) {	87	while (index < size) {
87	wchar_t uc = chr_decode(str, &index, size);	88	wchar_t uc = str_decode(str, &index, size);
88		89
89	if (!chr_encode(uc, data->dst, &data->len, data->size - 1))	90	if (chr_encode(uc, data->dst, &data->len, data->size - 1) != EOK)
90	break;	91	break;
91	}	92	}
92		93
93	/* Put trailing zero at end, but not count it	94	/* Put trailing zero at end, but not count it
94	* into data->len so it could be rewritten next time	95	* into data->len so it could be rewritten next time
Line 108...	Line 109...
108	data->dst[data->len] = 0;	109	data->dst[data->len] = 0;
109		110
110	return ((int) size);	111	return ((int) size);
111	}	112	}
112		113
113	/** Write UTF-32 string to given buffer.	114	/** Write wide string to given buffer.
114	*	115	*
115	* Write at most data->size plain characters including trailing zero.	116	* Write at most data->size plain characters including trailing zero.
116	* According to C99, snprintf() has to return number of characters that	117	* According to C99, snprintf() has to return number of characters that
117	* would have been written if enough space had been available. Hence	118	* would have been written if enough space had been available. Hence
118	* the return value is not the number of actually printed characters	119	* the return value is not the number of actually printed characters
119	* but size of the input string.	120	* but size of the input string.
120	*	121	*
121	* @param str Source UTF-32 string to print.	122	* @param str Source wide string to print.
122	* @param size Number of bytes in str.	123	* @param size Number of bytes in str.
123	* @param data Structure describing destination string, counter	124	* @param data Structure describing destination string, counter
124	* of used space and total string size.	125	* of used space and total string size.
125	*	126	*
126	* @return Number of UTF-8 characters to print (not characters actually	127	* @return Number of wide characters to print (not characters actually
127	* printed).	128	* printed).
128	*	129	*
129	*/	130	*/
130	static int vsnprintf_write_utf32(const wchar_t str, size_t size, vsnprintf_data_t data)	131	static int vsnprintf_wstr_write(const wchar_t str, size_t size, vsnprintf_data_t data)
131	{	132	{
132	index_t index = 0;	133	index_t index = 0;
133		134
134	while (index < (size / sizeof(wchar_t))) {	135	while (index < (size / sizeof(wchar_t))) {
135	size_t left = data->size - data->len;	136	size_t left = data->size - data->len;
Line 144...	Line 145...
144	data->dst[data->size - 1] = 0;	145	data->dst[data->size - 1] = 0;
145	data->len = data->size;	146	data->len = data->size;
146	return ((int) size);	147	return ((int) size);
147	}	148	}
148		149
149	if (!chr_encode(str[index], data->dst, &data->len, data->size - 1))	150	if (chr_encode(str[index], data->dst, &data->len, data->size - 1) != EOK)
150	break;	151	break;
151		152
152	index++;	153	index++;
153	}	154	}
154		155
Line 166...	Line 167...
166	size,	167	size,
167	0,	168	0,
168	str	169	str
169	};	170	};
170	printf_spec_t ps = {	171	printf_spec_t ps = {
171	(int() (const char , size_t, void *)) vsnprintf_write_utf8,	172	(int() (const char , size_t, void *)) vsnprintf_str_write,
172	(int() (const wchar_t , size_t, void *)) vsnprintf_write_utf32,	173	(int() (const wchar_t , size_t, void *)) vsnprintf_wstr_write,
173	&data	174	&data
174	};	175	};
175		176
176	/* Print 0 at end of string - fix the case that nothing will be printed */	177	/* Print 0 at end of string - fix the case that nothing will be printed */
177	if (size > 0)	178	if (size > 0)

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(root)//branches/dd/kernel/generic/src/printf/vsnprintf.c – Rev 4201 → 4296